Nuno Viegas (1985), also known as Metis, is a Portuguese artist and founder of the Policromia Crew art collective, who began his artistic journey with graffiti in 1999.

He later completed various Visual Arts degrees, and in 2014 moved to Rotterdam, where he did an internship with renowned artist Tymon de Laat. It was during his time in the Netherlands that he discovered a new artistic identity and began to develop his painting technique, with themes strongly influenced by the world of graffiti.

This has been the focal point of his production and continues to be his greatest source of inspiration. His work presents us with a contrast between the visually aggressive and sometimes dirty reality of traditional graffiti, and his own peaceful and clean representation of that same reality. The approach to this theme stands as a continuous tribute to all those who dedicate part of their lives to this art form: graffiti writers who keep tradition alive in a time where the definition of graffiti tends to be blurred and mixed with street art. Since 2016 he has been a constant presence in the international urban art scene, working on a variety of projects and showing his work on walls and in art galleries across the globe.